A method was developed to identify cross-connections between raw and pasteurized products in dairy plants. A flow diagram of the dairy plant is used to identify post-pasteurization pumps, storage tanks, fillers or other post-pasteurization processing equipment. An envelope is drawn on the flow diagram around all post-pasteurization equipment. Only the few pipelines that penetrate the envelope have the potential of a cross-connection. Each pipeline is traced to its origin to determine if it is a cross-connection.

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